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Adenoma morning.pptx
1. Case - 3
• Name - M.B
• Age -
• Sex - F
• Clinical data - ? Nephrolithiasis
• Patient complains for bilateral flank pain.
• Pre and post contrast CT of the abdomen with adrenal protocol was
done.
2. Imaging finding
• There is a well defined low attenuating left adrenal mass with a
hyperdense focus. It measures 2z1.5 cm in size and has average
attenuation of about -15%
• Post contrast study
• Absolute post contrast washout - 70%
• Relative post contrast washout - 113%
• The right adrenal gland appears normal
• Prominent subcutanous fat seen in the abdominal wall.
3. Adrenal adenoma : overview
• The most common adrenal mass
• Even in patients with a primary tumor elsewhere
• CT -
• NCECT - attenuation - <10HU
• CECT -
• APW - >60%
• RPW - >40%
• RPW is more accurate than the APW
• 15 minute delay is more accurate than 10 minute delay.
• Wash out kinetics don’t depent on amount of intracellular lipid.
5. Is it functioning.
• Majority of adrenal adenomas are non functioning ad
found as incidentalomas.
• There is no direct way of knowing on CT
• Indirect signs
• Atrophy of the contralateral adrenal gland.
• Excess fat proliferation.
6.
7. Why is it heterogenous
• With increasing size, heterogeneity of adenoma increases
8. Adrenal adenoma with hemorrhage
• Not common
• non-traumatic intra-tumoral adrenal
hemorrhage has been reported in
about 0.3% to 1.8% of autopsies
• Hemorrhage within adrenal
adenoma usually occurs in patients
receiving anticoagulation therapy
• Imaging appearance will depend on
age of the bleed.
9. Adenoma with mylolipomatous degeneration
• Some adenomas undergo myelo-lipomatous metaplasia or
degeneration in which this lipid content becomes macroscopic
10. Mixed lipid poor and lipid rich adenoma
• Impossible to differentiate from collision tumor on unenhanced CT
• Wash out kinetics is key in the differentiation
11.
12. Adrenal collision tumors
• Rare entities defined by two histologically separate tumors coexist in
the adrenal gland without significant histologic overlap or admixture.
• Most common collision tumors are that of adenoma and
myelolipoma.
• wide variety of combinations of adenomas, myelolipoma, pheochromocy
toma, adrenocortical carcinoma, and metastases have been described
• Most difficult senario is having a hyepervascular metastasis in the
setting of adrenal adenoma which may be impossible to differentiate
from mixed lipid poor and lipod rich adenoma.
Editor's Notes
A 58-year-old female with Cushing’s syndrome. Contrast-enhanced coronal CT image showing a left adrenal adenoma (arrow). Adrenocortical atrophy (arrowhead) is seen owing to excessive production of cortisol. The asterisks show a huge amount of fat, resulting from Cushing’s syndrome, the so-called adrenal Cushing’s.
Axial non-contrast CT showing left adrenal mass (straight arrow) with CT attenuation consistent with adrenal adenoma. Note the foci of low attenuation (curved arrow). Axial b T1 in-phase and c T1 out-of-phase images demonstrating signal drop of the background lesion (straight arrows) on out-of-phase image with India ink artifact around several punctate high signal intensity foci within the center of the mass (curved arrows). This lesion was pathologically proven to be an adrenal adenoma with foci of myelolipomatous degeneration
Axial a non-contrast, b venous-phase, and c delayed-phase contrast-enhanced CT images showing a right adrenal mass with two components: a peripheral component (straight arrow) displaying consistently low CT attenuation values and a central portion (curved arrow) displaying higher CT attenuation on non-contrast images fol- lowed by rapid homogenous enhancement and washout on IV con- trast administration. Central portion represents lipid-poor adenoma. Lesion was pathologically proven to be adrenal adenoma with central lipid-poor and a peripheral lipid-rich components